Poster
Abstract
Research summary supplied by the authors
Traditional chrome-free tanning agents, especially organic chrome-free tanning agents, tend to enhance the electronegativity of the fibers of crust leather during the tanning, which is negative for the absorption and binding of anionic materials in the subsequent processes. In this research, two kinds of cyanuric chloride-based cationic chrome-free tanning agents (TADM and TYDM) were synthesized, and their preparations were characterized by Fourier transform infrared spectrometer ( FT-IR) and nuclear magnetic resonance spectroscopy (1H-NMR). The thermal properties and morphology of the tanned leather were analyzed by using thermogravimetric analysis and scanning electron microscope (SEM). The results indicated that the multi-point active chlorine groups in syntans had an excellent cross-linking effect on collagen fibers, which increased the shrinkage temperatures of leathers tanned by TADM and TYDM to 74.3℃, and 75.4℃, respectively. The tanned leathers exhibited flat and fine grain, clear pore texture, and highly dispersed collagen fibers. The tensile strength, tear strength, and load elongation of the TADM tanned leather were 22.38MPa, 65.86N/mm, and 21.88%, respectively, and those of the TYDM tanned leather were 35.85MPa, 72.87N/mm, and 27.46% , respectively. Based on dyeing experiments, both TADM and TYDM tanning agents can improve the absorption of anionic dyes and subsequent chemical materials. In addition , the TADM and TYDM tanning agents had excellent environmental benefits by significantly reducing the levels of total solids (TS), dissolved solids (DS), suspended solids (SS), and chloride compared with traditional chrome tanning technology.